Counter with Even/Odd Indicator - Jquery Typing CST Test
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Counter with Even/Odd Indicator — Jquery Code
Shows whether the counter value is even or odd.
$(document).ready(function() {
var count = 0;
var isDark = false;
function updateCounter() {
$('#counter').text(count);
$('#parity').text(count % 2 === 0 ? 'Even' : 'Odd');
$('#container').toggleClass('dark-theme', isDark);
$('#container').toggleClass('light-theme', !isDark);
$('#theme-btn').text('Switch to ' + (isDark ? 'Light' : 'Dark') + ' Theme');
}
$('#increment').click(function() { count++; updateCounter(); });
$('#decrement').click(function() { count--; updateCounter(); });
$('#reset').click(function() { count = 0; updateCounter(); });
$('#theme-btn').click(function() { isDark = !isDark; updateCounter(); });
updateCounter();
});Jquery Language Guide
jQuery is a fast, small, and feature-rich JavaScript library designed to simplify DOM manipulation, event handling, animations, and AJAX interactions. It provides a unified API that works consistently across all major browsers.
Primary Use Cases
- ▸Legacy websites and enterprise systems
- ▸WordPress plugins and themes
- ▸Quick DOM scripting and UI enhancements
- ▸Form validation and AJAX requests
- ▸Projects needing wide browser compatibility
Notable Features
- ▸CSS-like DOM selectors
- ▸Chainable APIs
- ▸Animation utilities
- ▸AJAX helpers
- ▸Large plugin ecosystem
Origin & Creator
Created by John Resig in 2006 to provide a concise, cross-browser JavaScript API at a time when native browser features were inconsistent and limited.
Industrial Note
jQuery remains critical for legacy enterprise apps, WordPress themes/plugins, quick UI scripts, and environments where modern frameworks are overkill or unsupported.